Comment Caveat Emptor (Score 1) 65
About 2-4 sigma is about 3 sigma. Particle physics and astrophysics are littered with 3-sigma effects that turned out to be statistical fluctuations, errors, or not properly counting the number of rocks looked under, ie statistical penalties. Not saying these reports have any of these problems, but the 5 sigma bar to claim a discovery is there for good reason.